So researchers in Australia wanted to look at how dogs behaved after having their hormone levels increased. They took 62 dogs and gave half of them a nasal spray full of the hormone and a placebo to the other half.

After waiting 45 minutes, the dogs were then put through a series of tests in order to find a hidden treat. The researchers discovered the dogs given the oxytocin outperformed those given the placebo. This outcome remained the same when the same dogs were tested again 15 days later.

"Dogs do read their owners' every move. ... With my dogs, they know when I don't feel well, they read your facial expressions. They're so in tune to their human parents," the owner of a doggie daycare, Tania Isenstein, told ABC.